You may save more by finding a local dealer (if you want to go the AMSoil route) rahter than buying online using the preferred customer method. You'll have to pay shipping (I assume), which may cancel out any savings over local purchase and pickup. There is a form on their website you can fill out to get local dealer info.

(By the way, I used AMSoil ATF fluid for my 30k service. We have GIJoes here in the NW, and they carry AMSoil).